Eggs!

In case you've ever wondered what all the labels on different egg cartons actually mean, here's a list (from the same site that had the cow video):
http://www.hsus.org/farm/resources/pubs/animal_welfare_claims_on_egg_cartons.html

I've read before that the ones labeled organic are the most decently treated and healthiest, all things considered. Probably explains why they're the most expensive.